蕹菜对富营养化水体的氮磷去除及吸收动力学研究
Nitrogen and phosphorus removal performance and kinetics absorption by Ipomoea aquatica
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摘要: 以蕹菜(Ipomoea aquatica)为材料,采用改进的常规耗竭法,对氨氮、硝酸盐氮和无机磷的吸收动力学特性进行了研究。通过室内静态实验测定了蕹菜对富营养化水体的氮磷去除效率。用Michaelis-Menten方程来描述蕹菜对氨氮、硝酸盐氮和无机磷的吸收速率与溶液浓度的相互关系。结果表明:蕹菜对氨氮、硝酸盐氮和无机磷的最大吸收常数Vmax为23.59、2.88和1.52 μmol/(g FW?h),亲和力常数Km为1.90、10.94和0.97 μmol/L,可见蕹菜对氨氮的吸收速率和亲和力均高于硝酸盐氮,对无机磷的吸收速率较小;蕹菜对富营养化水体总氮、氨氮、总磷和有机磷的去除率分别为38.13%、44.85%、63.77%和53.95%;蕹菜对受试水体表现了良好的适应性和净化能力。Abstract: The absorption kinetics of ammonium,nitrate and phosphorus by Ipomoea aquatica were studied, after that ammonium,nitrate and inorganic phosphorus removal from eutrophic water was examined under indoor static simulation experimental condition. The relationship between the uptake rate and the concentration was depicted using the Michaelis-Menten equation. The purposes of this study were to provide a scientific foundation for the removal mechanism of ammonium,nitrate and inorganic phosphorus from water. The results showed that the maximum velocities (Vmax) of absorption on ammonium, nitrate and inorganic phosphorus were 23.59, 2.88 and 1.52 μmol/(g FW?h), the Michaelis constant(Km) were 1.90,10.94 and 0.97 μmol/L. The results of static state removals of TN, NH+4-N, TP, DOP by I. aquatica were 38.13%,44.85%,63.77% and 53.95%, respectively. It is proved that I. aquatica could be used to purify the eutrophicated water body.
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Key words:
- Ipomoea aquatica /
- ammonium /
- nitrate /
- nitrite /
- phosphorus
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